Harmonic mixer circuit

Abstract

A circuit includes: a first line to which input and output signal terminals are connected; a first transistor having a first terminal connected to the first line, a second terminal connected to a ground potential, and a control terminal supplied with a first oscillation signal, the first transistor outputting the first signal and its harmonic component; a second transistor having a first terminal connected to the first line, a second terminal connected to the ground potential, and a control terminal supplied with a second oscillation signal, the second transistor outputting the second signal and its harmonic component; a first harmonic generator connected to the control terminal of the first transistor and generates a harmonic component including the harmonic component by the first transistor; and a second harmonic generator connected to the control terminal of the second transistor and generates a harmonic component including the harmonic component by the second transistor.

What is claimed is: 
     
       1. An electronic circuit comprising:
 a first transmission line to which an input signal terminal and an output signal terminal are connected; 
 a first transistor having a first terminal connected to the first transmission line, a second terminal connected to a ground potential, and a control terminal supplied with a first oscillation signal, the first transistor outputting the first oscillation signal and a harmonic component thereof; 
 a second transistor having a first terminal connected to the first transmission line, a second terminal connected to the ground potential, and a control terminal supplied with a second oscillation signal, the second transistor outputting the second oscillation signal and a harmonic component thereof; 
 a first harmonic generation part connected to the control terminal of the first transistor and generates a harmonic component including the harmonic component generated by the first transistor; and 
 a second harmonic generation part connected to the control terminal of the second transistor and generates a harmonic component including the harmonic component generated by the second transistor, 
 wherein the harmonic component generated by the first harmonic generation part has a phase that cancels the harmonic component generated by the first transistor, and the harmonic component generated by the second harmonic generation part has a phase that cancels the harmonic component generated by the second transistor. 
 
     
     
       2. The electronic circuit according to  claim 1 , wherein:
 the first harmonic generation circuit includes a third transistor having a first terminal connected to the control terminal of the first transistor, a second terminal connected to the ground potential and a control terminal supplied with the first oscillation signal; and 
 the second harmonic generation circuit includes a fourth transistor having a first terminal connected to the control terminal of the second transistor, a second terminal connected to the ground potential and a control terminal supplied with the second oscillation signal. 
 
     
     
       3. The electronic circuit according to  claim 2 , wherein the first and second transistors have an identical characteristic, and the third and fourth transistors have an identical characteristic. 
     
     
       4. The electronic circuit according to  claim 2 , further comprising:
 a second transmission line connected between the control terminal of the third transistor and the first terminal of the third transistor; and 
 a third transmission line connected between the control terminal of the fourth transistor and the first terminal of the fourth transistor, 
 the first oscillation signal being applied to the control terminal of the first transistor via the second transmission line, 
 the second oscillation signal being applied to the control terminal of the second transistor via the second transmission line. 
 
     
     
       5. The electronic circuit according to  claim 4 , further comprising:
 a first condenser connected between a node between the second transmission line and the control terminal of the first transistor and the first terminal of the third transistor; and 
 a second condenser connected between a node between the third transmission line and the control terminal of the second transistor and the first terminal of the fourth transistor. 
 
     
     
       6. The electronic circuit according to  claim 1 , wherein the first oscillation signal and the second oscillation signal are inverted. 
     
     
       7. The electronic circuit according to  claim 6 , wherein the first oscillation signal and the second oscillation signal are generated from a common local signal. 
     
     
       8. The electronic circuit according to  claim 7 , further comprising:
 a 180° coupler having an input terminal, a first terminal and a second terminal, the input terminal receives the common local signal, the first output terminal outputs the first oscillation signal, and the second output terminal outputs the second oscillation signal. 
 
     
     
       9. The electronic circuit according to  claim 8 , wherein the 180° coupler comprised of a balun circuit. 
     
     
       10. The electronic circuit according to  claim 6 , wherein an IF signal is inputted into the input terminal connected with the first transmission line. 
     
     
       11. The electronic circuit according to  claim 10 , wherein an RF signal is outputted from the output terminal connected with the transmission line.